Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Fair Value of Financial Assets and Liabilities Measured on Recurring Basis (Detail)

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Fair Value Measurements - Fair Value of Financial Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($)
$ in Thousands
Jul. 31, 2015
Jan. 31, 2015
Available for sale marketable securities:    
Marketable securities, short-term $ 4,009 $ 7,516
Non-current marketable securities:    
Marketable securities, long-term 8,274 6,793
Total 15,910 15,884
Financial liabilities:    
Contingent consideration 1,487  
U.S. Treasury Notes and Bonds Conventional [Member]    
Available for sale marketable securities:    
Marketable securities, short-term 2,006 1,501
Non-current marketable securities:    
Marketable securities, long-term 5,770 4,286
U.S. Government Agency Issues Short Term [Member]    
Available for sale marketable securities:    
Marketable securities, short-term 2,003 6,015
U.S. Government Agency Issues Long Term [Member]    
Non-current marketable securities:    
Marketable securities, long-term 2,504 2,507
Money Market Accounts [Member]    
Financial assets:    
Cash and cash equivalents 3,627 1,575
Fair Value, Inputs, Level 1 [Member]    
Non-current marketable securities:    
Total 11,403 7,362
Fair Value, Inputs, Level 1 [Member] | U.S. Treasury Notes and Bonds Conventional [Member]    
Available for sale marketable securities:    
Marketable securities, short-term 2,006 1,501
Non-current marketable securities:    
Marketable securities, long-term 5,770 4,286
Fair Value, Inputs, Level 1 [Member] | Money Market Accounts [Member]    
Financial assets:    
Cash and cash equivalents 3,627 1,575
Fair Value, Inputs, Level 2 [Member]    
Non-current marketable securities:    
Total 4,507 8,522
Fair Value, Inputs, Level 2 [Member] | U.S. Government Agency Issues Short Term [Member]    
Available for sale marketable securities:    
Marketable securities, short-term 2,003 6,015
Fair Value, Inputs, Level 2 [Member] | U.S. Government Agency Issues Long Term [Member]    
Non-current marketable securities:    
Marketable securities, long-term 2,504 $ 2,507
Fair Value, Inputs, Level 3 [Member]    
Financial liabilities:    
Contingent consideration $ 1,487